This is identical to the ParserRuleReturnScope except that
the start property is a tree nodes not Token object
when you are parsing trees. To be generic the tree node types
have to be Object.
protected var _start:Object
First node or root node of tree matched for this rule.
start:Object
[read-write]Implementation
public function get start():Object
public function set start(value:Object):void
tree:Object
[read-write]
Has a value potentially if output=AST;
Implementation
public function get tree():Object
public function set tree(value:Object):void
values:Object
[read-only]Implementation
public function get values():Object